(If you are on the POPL 2020 program committee, please stop reading until after your reviews are done.)
It's been a few months since I've last blogged, so I figure I should say what I have been up to lately. The answer seems to be comonads. I have two new draft papers, both of which involve comonadic type theories in a fairly critical way. (I suppose that this makes me a type-theoretic hipster, who doesn't do monads now that they're popular.)